You probably dodged the bullet this time because it had been a while since you ejaculated. Unfortunately, sperm can live a while in your urethra. If she is not on the pill, what were you doing with your uncovered penis inside her vagina? Please pay a little more attention during sex-education class, you could so easily get her pregnant doing a stunt like that. I would guess that despite it being roughly the time when she might have been ovulating, you did not have a lot of sperm in your urethra any longer after having peed four times. But please get real about using condoms every time, and she should also be on the pill or an IUD, or sooner or later you *will* be a daddy. Get rational and wear protection. Good luck!
Any time you are having sex without protection, you've risked pregnancy. Your pre ejaculation absolutely could impregnate her. She will need to see If her period shows up and if not, take a pregnancy test. ALWAYS use protection. good luck